package cn.paul.wechatshop.utils;

import java.security.MessageDigest;

/**
 * Created by geely
 */
public class MD5Util {

    private static final String hexDigits[] = {"0", "1", "2", "3", "4", "5",
            "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"};

    private static String byteArrayToHexString(byte[] b) {
        StringBuffer resultSb = new StringBuffer();
        for (int i = 0; i < b.length; i++)
            resultSb.append(byteToHexString(b[i]));

        return resultSb.toString();
    }

    private static String byteToHexString(byte b) {
        int n = b;
        if (n < 0)
            n += 256;
        int d1 = n / 16;
        int d2 = n % 16;
        return hexDigits[d1] + hexDigits[d2];
    }

    /**
     * 得到大写的MD5值
     * @param origin
     * @return
     */
    public static String MD5EncodeUtf8(String origin) {
        try {
            origin = origin + PropertiesUtil.getProperty("password.salt");
            MessageDigest md = MessageDigest.getInstance("MD5");
            origin = byteArrayToHexString(md.digest(origin.getBytes("utf-8"))).toUpperCase();
            return origin;
        } catch (Exception exception) {
            throw new RuntimeException(exception);
        }


    }

}
